STM32G473VBT6 ST Mainstream Arm Cortex-M4 Mixed-Signal 32-bit MCU 128KB Flash 128KB SRAM Σ-Δ OpAmp DAC Comparator CAN FD USB LQFP-100

STM32G473VBT6 Product Overview

STM32G473VBT6 is a Cortex-M4 MCU at 170 MHz with FPU and math accelerator, LQFP-100. 128 KB Flash, 128 KB SRAM, USB 2.0 FS device (crystal-less), CAN FD, two 12-bit ADCs (5 Msps, 21 ch), two 12-bit DACs, four op-amps (PGA), three comparators, four Σ-Δ modulators (DFSDM), advanced motor control PWM, LP timers, RTC, 3×USART/UART, 2×SPI/I2S, 2×I2C. 86 x 5 V-tolerant I/Os. 1.7–3.6 V, -40–85 °C. Compared to G473CBT6 (48-pin) or G473RCT6 (64-pin), provides 86 I/Os, enabling greater system integration for precision sensing, digital power, and motor control applications requiring extensive pin connectivity.

STM32G473VBT6 Core Features

Core: Cortex-M4 170 MHz, FPU + ART Accelerator + Math Accelerator (FMAC, CORDIC)

Memory: 128 KB Flash, 128 KB SRAM

Analog: 4×PGAs, 2×12-bit ADCs (5 Msps, 21 ch), 2×12-bit DACs, 3×Comparators

Σ-Δ Modulators: 4×Σ-Δ modulators with DFSDM for high-precision sensor interfaces

Motor Control: 2×Advanced Timers (PWM/Deadtime/Brake), multiple GP/LP timers

Connectivity: USB 2.0 FS (Crystal-less), CAN FD, 3×USART/UART, 2×SPI/I2S, 2×I2C

I/Os: 86 (5 V-tolerant)

Package: LQFP-100

STM32G473VBT6 Applications

Digital Power: SMPS, Inverters, PFC

Motor Control: FOC, BLDC/PMSM Drives, Servo Controllers

Precision Sensing: High-accuracy Σ-Δ sensor measurement, industrial transmitters

Instrumentation: High-Precision Data Acquisition & Signal Conditioning

Consumer Electronics: Drones, Power Tools, Portable Medical

Automotive/Industrial: CAN FD Nodes, Industrial Automation

STM32G473VBT6 Key Advantages

128 KB Flash + 128 KB SRAM: Balanced memory for complex control and data processing

4×Σ-Δ Modulators + 4×Op-Amps + 3×Comparators + ADC/DAC: Top-tier analog integration for precision measurement and control

170 MHz Cortex-M4 + FPU + Math Accelerator: Blazing-fast DSP and control

USB 2.0 + CAN FD: High-speed USB and industrial CAN bus on one chip

86 I/Os in 100-Pin Large Package: Abundant pin resources for I/O-intensive complex systems

1.7–3.6 V Wide Supply: Flexible for battery and various power sources

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FAQ

1. What is the STM32G473VBT6, and how does it differ from the STM32G473VET6?
The STM32G473VBT6 is a high‑performance mixed‑signal microcontroller from STMicroelectronics' STM32G4 series, built around an Arm® Cortex®‑M4 core with FPU and DSP extensions running at 170 MHz, in an LQFP‑100 package. It is the smallest‑Flash member of the G473 family, providing 128 KB dual‑bank Flash and 128 KB SRAM, while retaining four rail‑to‑rail op‑amps, four ultra‑low‑power comparators, FDCAN, USB‑C, and multiple advanced timers. Compared to the VET6 (512 KB Flash) in the same package, the VBT6 delivers exactly the same analog and digital peripherals at a lower cost, making it ideal for cost‑sensitive, high‑volume applications with optimized code size that still require excellent analog performance and rich communication interfaces.

2. Is 128 KB of Flash sufficient? Can it run motor control or digital power algorithms?
With careful optimization, 128 KB of Flash can comfortably accommodate a complete motor FOC control firmware, basic digital power control algorithms (e.g., buck/boost converters), a CANopen slave stack, and routine system‑monitoring logic. If your application does not require a large graphical interface or a complex file system, 128 KB is sufficient. If more program storage is needed, you can seamlessly upgrade to the pin‑compatible VET6 (512 KB Flash) with zero hardware changes.

3. Compared to the STM32G474 series, what features does the G473 lack? How should I choose?
The G473 series primarily omits the high‑resolution timer (HRTIM) and has slightly fewer op‑amps and comparators (typically four of each, versus five op‑amps and seven comparators on the G474). If your application does not require extremely high PWM resolution (e.g., for LLC resonant converters or phase‑shifted full‑bridges) and the standard advanced timers (such as TIM1/TIM8) already meet your accuracy needs, the G473 offers the same processing performance and communication interfaces at a more competitive cost. It is well‑suited for general‑purpose variable‑frequency drives, industrial sensors, power tools, and home‑appliance controllers.

4. What can the built‑in op‑amps and comparators do? Are external analog chips still needed?
The chip integrates four rail‑to‑rail operational amplifiers and four ultra‑low‑power comparators. The op‑amps can directly handle current‑sense signals and amplify and filter small sensor signals, while the comparators are used for over‑current protection and zero‑crossing detection. These analog blocks are tightly coupled internally with ADCs and timers to form complete control loops, greatly reducing the need for external op‑amp and comparator ICs, thereby significantly lowering BOM cost and PCB area.

5. Does the 128 KB Flash support dual‑bank and OTA updates? How can update safety be ensured?
Yes. Despite the 128‑KB capacity, it still supports a dual‑bank architecture (each bank 64 KB), allowing current firmware to execute from one bank while the other is erased and programmed. After a new firmware image is downloaded to the alternate bank and verified, a simple boot‑address switch completes the update. If a power loss or verification failure occurs, the system automatically rolls back to the original firmware, guaranteeing the device is never bricked. Combined with code readout protection (RDP) and the Memory Protection Unit (MPU), a secure and reliable remote firmware‑update scheme can be implemented.

6. What high‑speed communication interfaces does the chip offer? Does it support CAN FD?
It integrates up to three FDCAN (Flexible Data‑Rate CAN) controllers, which are backward‑compatible with CAN 2.0 while supporting data rates up to 5 Mbps and payloads up to 64 bytes. Additionally, it provides multiple UARTs, SPIs, I²Cs, and I²S interfaces. All of these can operate simultaneously, making the chip ideal for industrial automation, vehicle networks, and distributed control systems that require high‑speed, reliable communication. The LQFP‑100 package provides 82 I/Os, allowing multiple CAN FD channels and other peripherals to be brought out easily without pin‑conflict concerns.

7. What can the USB‑C interface on the STM32G473VBT6 do? Does it support Power Delivery?
The integrated USB‑C power‑delivery and communication controller supports USB 2.0 full‑speed device communication and can deliver up to 15 W (5 V/3 A) through simple CC‑pin detection. It does not implement the full USB Power Delivery (PD) protocol. If a complete PD stack is required, an external dedicated PD controller can be added. For applications that do not need PD, the MCU can be powered and communicate directly over USB‑C, making it ideal for portable devices and small USB‑powered instruments.

8. What is its power consumption like? Is it suitable for industrial wide‑temperature environments?
The STM32G4 series is built on an advanced 90 nm process, with a run‑mode current as low as about 100 µA/MHz. It supports multiple low‑power modes—Sleep, Stop, and Standby—with Standby current dropping to the micro‑amp range. Combined with fast wake‑up times, it is well‑suited for battery‑powered portable industrial equipment and handheld instruments that require long battery life. The chip is typically rated for the industrial temperature range (-40 °C to 85 °C) and can operate reliably over the long term in harsh industrial environments.

9. What development tools are needed for the STM32G473VBT6, and is it compatible with previous STM32 ecosystems?
It is fully compatible with the STM32Cube ecosystem, including the free STM32CubeMX configuration tool, STM32CubeIDE integrated development environment, and the STM32CubeG4 firmware package. If you have previously worked with STM32F3 or STM32F4 series, a large portion of HAL code can be reused; the main adjustments involve analog‑peripheral configuration and pin mapping. Official example projects and reference designs for motor control and digital power are also provided to accelerate development.

10. If I later need larger Flash or higher processing performance, what upgrade options are available?
If you need more program storage, you can directly upgrade to the pin‑compatible STM32G473VET6 (512 KB Flash) with zero hardware changes. If the high‑resolution timer (HRTIM) or more op‑amps and comparators are required, you can move to the STM32G474VET6. For greater computational power and larger SRAM, consider the STM32H7 series (such as the STM32H723 or H743). Because all these devices belong to the same STM32 ecosystem, code and hardware designs can be highly reused, and migration effort is minimal.